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  <meta name="description" content="架构组通知对cobar的driver进行升级，因为知道cobar已经很久没更新了，应该是公司内部做了升级，就去比对了一些代码。感觉看cobar的driver挺有收获，建议刚入门一两年的小伙伴都可以看看。看完这个Demo能够让一些新手理解如何使用TCP去调用Server，如何去解析从Server反馈的二进制文件，这里分享一下我的收获。">
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          Cobar-Drive理解
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        <p>架构组通知对cobar的driver进行升级，因为知道cobar已经很久没更新了，应该是公司内部做了升级，就去比对了一些代码。感觉看cobar的driver挺有收获，建议刚入门一两年的小伙伴都可以看看。看完这个Demo能够让一些新手理解如何使用TCP去调用Server，如何去解析从Server反馈的二进制文件，这里分享一下我的收获。</p>
<a id="more"></a>

<p>驱动整体就是通过TCP和cobar的server进行长连接，依据一些协议去处理握手包，数据包等。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">connect</span><span class="params">(<span class="keyword">int</span> timeout)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="comment">// 网络IO参数设置</span></span><br><span class="line">        socket = <span class="keyword">new</span> Socket().connect(<span class="keyword">new</span> InetSocketAddress(host, port), timeout);</span><br><span class="line">        in = <span class="keyword">new</span> BufferedInputStream(socket.getInputStream(), INPUT_STREAM_BUFFER);</span><br><span class="line">        out = <span class="keyword">new</span> BufferedOutputStream(socket.getOutputStream(), OUTPUT_STREAM_BUFFER);</span><br><span class="line"></span><br><span class="line">        <span class="comment">// 读取握手数据包</span></span><br><span class="line">        <span class="comment">// TODO 这个OO的思想很有意思，由对象去处理数据，而不是由操作者去处理数据</span></span><br><span class="line">        BinaryPacket initPacket = <span class="keyword">new</span> BinaryPacket();</span><br><span class="line">        initPacket.read(in);</span><br><span class="line">        HandshakePacket hsp = <span class="keyword">new</span> HandshakePacket();</span><br><span class="line">        hsp.read(initPacket);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<p>那么问题来了，我们知道TCP中都是通过二进制来传输，那么如何将一些文件，例如int，char，甚至是file转为byte呢？先重温下不同类型的大小<br>int -&gt; 4个byte<br>char -&gt; 2个byte<br>file -&gt; 一堆byte<br>如何做到转换呢？请看代码：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">readUB3</span><span class="params">(InputStream in)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line">        <span class="keyword">byte</span>[] b = <span class="keyword">new</span> <span class="keyword">byte</span>[<span class="number">4</span>];</span><br><span class="line">        read(in, b, <span class="number">0</span>, b.length);</span><br><span class="line">        <span class="keyword">int</span> i = b[<span class="number">0</span>] &amp; <span class="number">0xff</span>;</span><br><span class="line">        i |= (b[<span class="number">1</span>] &amp; <span class="number">0xff</span>) &lt;&lt; <span class="number">8</span>;</span><br><span class="line">        i |= (b[<span class="number">2</span>] &amp; <span class="number">0xff</span>) &lt;&lt; <span class="number">16</span>;</span><br><span class="line">        i |= (b[<span class="number">3</span>] &amp; <span class="number">0xff</span>) &lt;&lt; <span class="number">24</span>;</span><br><span class="line">        <span class="keyword">return</span> i;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>看到这个像我这种对二进制不太熟的是不是有点闷，0xff是啥，|= 又是啥。|= 就是进行或运算，而0xff就是1111_1111，简单的说就是255。</p>
<h2 id="为什么需要0xff"><a href="#为什么需要0xff" class="headerlink" title="为什么需要0xff"></a>为什么需要0xff</h2><p>让我们先尝试几个Demo</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">System.out.println(Integer.toBinaryString(<span class="number">0xff</span>));	<span class="comment">// 结果 11111111</span></span><br><span class="line">System.out.println(Integer.toBinaryString(-<span class="number">1</span>));		<span class="comment">// 结果 11111111111111111111111111111111</span></span><br><span class="line"></span><br><span class="line">System.out.println(Integer.toHexString(<span class="number">0xff</span>));		<span class="comment">// 结果ff</span></span><br><span class="line">System.out.println(Integer.toHexString(-<span class="number">1</span>));		<span class="comment">// 结果ffff</span></span><br><span class="line"></span><br><span class="line">System.out.println(Integer.toBinaryString(<span class="number">1</span>));		<span class="comment">// 结果1</span></span><br><span class="line">System.out.println(Integer.toHexString(<span class="number">1</span>));			<span class="comment">// 结果1</span></span><br></pre></td></tr></table></figure>
<p>那么这就牵涉到了计算机原理，不知道你忘了没？反正我是忘了。</p>
<h3 id="反码"><a href="#反码" class="headerlink" title="反码"></a>反码</h3><blockquote>
<p>正数反码和原码相同<br>对于负数，除符号位其余各位是对原码取反</p>
</blockquote>
<h3 id="补码"><a href="#补码" class="headerlink" title="补码"></a>补码</h3><blockquote>
<p>整数的补码与原码相同<br>负数的补码就是反码末位加1</p>
</blockquote>
<p>在将byte转为int的时候：</p>
<blockquote>
<p>补位是利用最高位</p>
</blockquote>
<ol>
<li>如果是正数 1-&gt; 00000001 -&gt; 00000001</li>
<li>如果是负数-1-&gt; 11111111 -&gt; 11111111_11111111_11111111_11111111 -&gt; ffff<br>也就是说byte的-1变成了int的-1</li>
</ol>
<p>从低位转到高位其实是有问题的，容量就不一样了。</p>
<p>ps: 但是转换对于十进制的值是不影响的</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 做个实验</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">int</span> i = -<span class="number">127</span>; i &lt; <span class="number">128</span>; i++) &#123;</span><br><span class="line"> <span class="keyword">byte</span> a = (<span class="keyword">byte</span>) i;</span><br><span class="line">    System.out.println(<span class="number">0xff</span> &lt;&lt; <span class="number">24</span> | <span class="number">0xff</span> &lt;&lt; <span class="number">16</span> | <span class="number">0xff</span> &lt;&lt; <span class="number">8</span> | i);</span><br><span class="line">    System.out.println(<span class="number">0xff</span> &lt;&lt; <span class="number">24</span> | <span class="number">0xff</span> &lt;&lt; <span class="number">16</span> | <span class="number">0xff</span> &lt;&lt; <span class="number">8</span> | a);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 结果两者的值都是相同的</span></span><br></pre></td></tr></table></figure>
<h2 id="为什么int字节需要操作"><a href="#为什么int字节需要操作" class="headerlink" title="为什么int字节需要操作"></a>为什么int字节需要操作</h2><p>原来不是很理解，在计算机世界中，不应该所有的东西都是属于二进制。这样而言，int直接转byte不就行了？但是应该这么理解，我们使用的java是基于二进制之上的，我们所有的操作可能都还需要在转化成二进制。而如果对于Excel或者是Txt文件，他们已经是二进制存在了，那么直接操作就可以了，需要注意的就是在解码的时候，需要用合适的解码方式。</p>
<h2 id="公司cobar的升级细节"><a href="#公司cobar的升级细节" class="headerlink" title="公司cobar的升级细节"></a>公司cobar的升级细节</h2><p>因为不是什么很大的修改，讲一下也无妨。公司内部配的是多个cobar的server，以备容灾，所以加了个</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> String URL_COBAR_CLUSTER_PREFIX = <span class="string">&quot;jdbc:cobar_cluster://&quot;</span>;</span><br></pre></td></tr></table></figure>
<p>配置文件改为<br>supplychain.jdbc.url=jdbc:cobar_cluster://common1101.cobar.2dfire-daily.com,common1111.cobar.2dfire-daily.com:8066/scmdb?useUnicode=true&amp;characterEncoding=utf-8&amp;zeroDateTimeBehavior=convertToNull&amp;autoReconnect=true</p>
<p>如果第一个cobar-server连接失败，会尝试第二个cobar-server。</p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>从前感觉很神秘的TCP以及二进制，还有一些协议什么的，以及最url的处理，在一个简单的cobar-drive中就能一窥概貌，真的不枉好奇心一把。<br>还有个小tips，曾经看到过一个解决方案，如何让没使用过solr的人快速上手动态语句的solr？解决方案：可以通过改写MyBatis的drive来实现用MyBatis的语句来实现solr语句。</p>

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